The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 750 g?
- How much is the postage if a parcel has a mass of 2.8 kg?
(a)
Cost
= 3.80 + 0.90
= $4.70
(b)
1 kg = 1000 g
2.8 kg = 2.8 x 1000 = 2800 g
Cost for first 650 g = $3.80
Remaining mass
= 2800 - 650
= 2150 g
Number of sets of 100 g
= 2150 ÷ 100
= 21.5
Number of sets of 100 g to pay for
= 21 + 1
= 22
Cost for remaining 2150 g
= 22 x 0.90
= $19.80
Total cost
= 19.80 + 3.80
= $23.60
Answer(s): (a) $4.70; (b) $23.60